The drama never stops when it comes to the Real Housewives!Brandi Glanville, Kyle Richards, Kim Richards, Lisa Vanderpump, Yolanda Foster, Joyce Giraud and Carlton Gebbia came together on Wednesday for the premiere of Season 4 of their show The Real Housewives of Beverly Hills, but according to an insider, one lady wasn’t exactly welcomed by the rest.

“Lisa was totally ganged up on by all the girls, it was so childish,” a source tells Star, exclusively. “The unspoken rule is that no matter what goes on during filming, the ladies should be civil at events. Instead, they all snubbed her and treated her like crap.”

In fact, our insider reveals that the women were planning on excluding Lisa all along — which is why the 53-year-old was the only one to show up in a long, formal gown. “The whole cast, except for Joyce, decided to wear short dresses and not tell Lisa about it,” our source explains. “So she turned up in a long dress and immediately looked like a snob. Luckily, Joyce also wore a long dress in support of Lisa.”

The insider says that the ladies’ jealousy is mostly rooted in the fact that their premiere was shared with that of Lisa’s spinoff show, Vanderpump Rules, as well as because of her popularity with the public. “It’s sad,” the source admits, “but Lisa is not a victim and she won’t let them get to her!”